Inspection Procedure 2: Malfunction of the ignition switch power supply system


caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

COMMENTS ON TROUBLE SYMPTOM



POSSIBLE CAUSES



  • Malfunction of the ignition switch
  • Malfunction of the fuse
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Voltage measurement at ignition switch connector


(1)Disconnect the ignition switch connector and measure the voltage at ignition switch connector harness side.
(2)Check the voltage between the ignition switch connector (power supply terminal) and body earth.
OK: System voltage

Q. Is the check result normal?





STEP 2. Check the fuse.


Q. Is the check result normal?





STEP 3. Check of open circuit in IG+ line between ignition switch connector and ETACS-ECU connector.


Q. Is the check result normal?





STEP 4. Check the ignition switch.



Q. Is the ignition switch in good condition?





STEP 5. Retest the system.


Q. Do the device and the system work normally when the ignition switch is operated?